Rome borrowed the idea of the aqueduct from the Etruscans and the Greeks, but the Romans perfected the idea. They perfected it by bringing lots of fresh clean, and consistent water to the city, it also benefited the sewage system because the aqueduct provided consistent water to flush the gross stuff out of the city, another benefit is irrigation. The Romans were master builders, so they only put 10% of the aqueduct above ground in case there was a war, they wouldn’t want there enemies knowing where to stop the water flow into the city. And they built stackable bridges for the aqueduct rather than two side-by-side bridges for the water to travel. For the Romans to keep the water flowing to the city, they built the aqueducts very slightly slanted over many miles. I am fascinated by how much water the aqueduct would have to bring into the cities by rainwater or rivers or by the mountains